If I request an adjustment in my marketplace premium tax credit, how long will it be before that takes effect?

The adjustment will take effect by the first day of the month following the date of the redetermination notice. For example, if an enrollee reports a change in income on June 25 and the marketplace verifies the change and sends a redetermination notice to the enrollee on July 3, the change will be implemented on August 1. (45 C.F.R. § 155.330).